Aqueous Stable Ti 3 C 2 MXene Membrane with Fast and Photoswitchable Nanofluidic Transport

Junchao Lao, Ruijing Lv, Jun Gao*, Aoxuan Wang, Jinsong Wu, Jiayan Luo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

110 Scopus citations


High, stable, and modulatable ionic conductivity is important for many nanofluidic applications of layered two-dimensional (2D) membranes. In this study, we demonstrate a proton and ionic conductivity of the Ti 3 C 2 T x membrane that is orders of magnitude higher than that of bulk solution at low concentrations. Importantly, the membrane is highly stable in aqueous solution without any modification, due to the strong and attractive interlayer van der Waals interaction and weak electrostatic repulsive interaction. Furthermore, by exploiting the intrinsic photothermal property of MXene, we demonstrate that the ionic conductivity can be reversely, rapidly, and completely switched on or off with laser light. This study should prove MXene membrane as a suitable platform to study and utilize nanofluidic ion transport. It should also inspire future studies to manipulate the mass transport through 2D membranes using their inherent physicochemical properties.

Original languageEnglish (US)
Pages (from-to)12464-12471
Number of pages8
JournalACS nano
Issue number12
StatePublished - Dec 26 2018


  • MXene
  • aqueous stability
  • nanofluidic
  • photocontrolled
  • surface charge

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)


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